SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8aea3387569d545609d2e7ff368538fd89389b3a8040963904d152cf6a323e' 
  AND token = 'uyzFvqbLEMOgtHrR/NL7tVvBah4idWmN+bmn8u8Sh8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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