SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce781a8e9bdbd48d02a313f2aff6f650973abaaed138a41c7f33021478824948' 
  AND token = '0wOjAGgBXzdnSAkkjkOGPNDTcDOChsB/lPXyr4awsR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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