SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7554376d3d656c1dceee571ffa8ec9cabb6dbc45f5b54f18e30e7868ae49062' 
  AND token = 'kwzW9TnA+SzPNK9DRn8udgHylKrlEl6tHbxl8W+3BLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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