SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595a1ddcccf242c21aac257d90a317859a2f0919ae5a64ee4bddde6615d80e16' 
  AND token = 'QaEdq3cbH7U5e/GwEO161p3GfJ2oaYN06dXfAt2wu4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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