SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '453637cf95d07d045c40f5dbbbf23c1943cf898b723924d0599416af456d0cd1' 
  AND token = 'mdJB/gV/WMnFQBjU+ew2/04rQRxZZV2qNZBE8MX5XwU=' 
  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