SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d028c3172d2834120e452e79e9f39d87d17ef57dfbcd9a5be5e07f5c938d12' 
  AND token = 'Z6qorAwIJMK6OWaFOjpldYjmiHebUwZqZu3swnXi+T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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