Option 2 is the right answer. Let us look at the options one by one:
few quantify plural countable nouns and is used for a small number of something.
a few means some.
a little means a small amount.
the few means not many, but all of those that are mentioned.
To have a few minutes means to have a short period of time available. So the correct word is -- a few. The correct sentence is --Luckily we have got a few minutes to spare.