SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b29d42e24e5eb2354478e2a1f8aced3ff92c555e62a92aad8e04d84cb393c8' 
  AND token = 'O/pxXBy8QBAklXLRHVkpYVCOKvoA7+IFIgdGbRCfUP8=' 
  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