SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4959b24b92a23810f4bbf6012faff5bb064cdc73524559d12359263c8b39fe' 
  AND token = 'gqd1S9dfQKDCAd/d0d+QEyWxxd+Gs83yY8CIxqJYHf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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