This is an irregular verb. It follows the conjugation pattern of the verb ficar.
Present:
Eu busco minhas chaves toda manhã.
Busco as minhas chaves todas as manhãs.
I look for my keys every morning.
Preterite:
A Ana buscou o Miguel no aeroporto.
Ana picked up Miguel at the airport.
Conditional:
(Eu) buscaria outra solução.
I would look for another solution.