SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d16bb9e41f348dc044d7e1b4563157b8d9ad71741eccadd2ca6c801f27e0814' 
  AND token = 'mYlg1iCbOS/o3Zl7zu6zgHfDow0mnmEcpxskL8N/A4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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