SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbca71fb70d15b07d3313ff51aeda0699dd54f875001ac48ff4e81226d777c8' 
  AND token = 'GOTH+QDOndRZ5qVGcnkwe+W5EmvRYIeffitop6MlOLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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