A pack of 5 units of Chick Fil-A Nuggets has 7 g of carbohydrates and is not considered suitable for the ketogenic diet. While you can splurge your carbs on this, Chick-Fil-A has grilled chicken nuggets, which contain 1 g of carbohydrates per 5 pieces. The reason grilled chicken nuggets are keto-friendly is that they're not breaded. They're basically naked chicken nuggets that have been grilled instead of fried.
You can also order a salad from the garden and add whatever protein you prefer, whether it's grilled nuggets or grilled chicken. Maybe you desperately need lunch for a road trip, or you just like chicken nuggets (the same thing), when you suddenly start dreaming about Chick-Fil-A.