SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2d0e5a6b8cdd2a94005a36ed1795d680053fcfdbbe24efd87c7e095ffec9bd' 
  AND token = 'uz76/35oGlxBKLuevqJVb0XJXQ+x6QRazW/hASq4dqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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