SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dade098da7fedce92de5f38cd60ec4ab384a1b4a05524c9a40365adbf56347' 
  AND token = 'y/SqIsFWpmRSB+Xgro+lp+ifY43MSCW+P/Ipvt3rl2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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