SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a248d90ca0502eb218a2e33c520773b5c14d0262ddd60606b35a9172e35983' 
  AND token = 'qyBGz6x13/aZ+axgEV4/suKb7DI1Utk1fqo6cRk2Wls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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