SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27f0006df6889c032599853b06d3424bbe63088b1cc6e1582320451daf1c135' 
  AND token = 'C4/S3cAgnGo7oJXLftqqIFiZUmBFcKvYeyAEZey70fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables