SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0e90ab91ed05312ba5585b8d51e66e3b732f0dc3f1326614dee4946adf43d8' 
  AND token = 'dxWmH4DL7608w5csyDVAcxTpeUduyZTLnlP/6v/BbmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

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