I too used to think that you had to do a lot of cooking on low-carb. In fact, it was the excuse I gave myself when my weight would stall or climb during the times of year when my health issues flared such as the I'm experiencing now and every November, as the weather gets colder and wetter. Such weather always aggravates arthritis and fibromyalgia quite severely. I don't have pain meds strong enough to be comfortable, so I spend a lot of time under a comforter and electric blanket until I get accustomed to the wheater (for me, weather change is much worse than consistent cold or otherwise unpleasant weather. In the spring and fall are the worst, and I'd rather have ten days of rain than inconsistent weather - guess I shouldn't live in the midwest if I want consistent weather.)
To eat low-carb without cooking, you still do have to You have to plan ahead, but there are a lot of ready-to-eat foods that can be incorporated into Atkins and other low-carb plans quite easily.
Rotisserie chickens are the obvious choice, but canned meats and fish are another. Cheese cubes. Raw veggies and flavored cream cheese...
Eating out is a challenge, but there are a lot of grab-and-go low-carb foods.
Although there are quite a few salad options if you bring your own dressing.
Ironically, convenience stores are a great source of low-carb options (you just have to eat things a little differently). Our KwikTrip gas station sells a lot of hot foods like burgers, brats, hot dogs. I sometimes buy the burgers or the jalapeno dogs (an Oscar Meyer Product, that I believe fits into induction, if I'm remembering correctly) and would just remove the bun on the hamburger, or not use on on the hot dogs (the hot dogs were on those rolling grills, so I'd just take two hot dogs without buns and would hit the condiment tray for onions and a bit of ranch dressing, salsa or mustard).
Subway salads were an easy choice (some of their dressings too).
For me, fast food isn't as big of a concern, so most of my ready-to-eat items are needed during sick and down days at home. I can plan ahead and cook and use freezer meals (and I do that too), but I also buy a lot of ready-to-eat stuff for bad days. Sometimes boiling eggs is about the extent of my cooking abilities, so I boil a dozen at a time.
Asian groceries are great sources for canned fish. I love these little cans of fish (Smiling Fish is an especially good brand), sardines and mackerel, in flavored sauces (you do have to read the labels, because a few of the flavors are higher in carbs, but most are very low). They come in all sorts of flavors, including spicy curries. I bought one as a novelty (hoping it would be good, but expecting it to be nasty - instead I thought it was awesome).
Even in the ordinary grocery stores there are a lot of ready-to-eat low-carb options, but you have to explore the grocery store with new eyes, looking for foods that will work - and food combinations you might not have ever thought of before (I do a lot of lunches that my italian grandmother would have called antipasta, cold cuts and cheese with lettuce and other cold veggies and an assortment of olives and pickles).
I know that soy tvp is a gray area for Atkins. It's high enough in protein and low enough in carbs to fit into first week OWL if not induction, but because soy is a legume it ordinarily wouldn't be added until much later in OWL. That's a shame, because tvp comes in handy as a breakfast cereal (sort of like grapenuts in flavor and texture) with almond milk and maybe some Splenda and cinnamon. Still it's not something to eat tremendous amounts of, for a variety of reasons that really have nothing to do with the carb count.