SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0e38733d7cb6b630f801d02fe2cfcab2cd0db51806e2248f3af758169fc9f6' 
  AND token = 'gLr52XlAqS8XfPeGnFJwou/v3PnCklWsqcev+9C0Hko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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