Yes, both are equally good.

Can you say " At what are you looking?" instead? In theory: yes. It is grammatically correct. In practive: no! Native speakers never phrase questions like this in real life. This construction only exists in outdated grammar books.

Michael, Thank you so much for your help! I think I understand with the expression of you and the link.

Mick, 「ちょっと」だけだと、ちょっと分からないです。 良くないという事でしょうか？

https://www.englishforums.com/English/AtWhatAreYouLooking/bnbxgq/post.htm Your second alternative is acceptable grammatically, but not current usage. Probably you'd only hear this in a comedy sketch, spoken by a character trying to sound cleverer than he is.