SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc2d409d29dbc4fa0fa9dfe664c19583b75d60988b092745037f64720b2987d' 
  AND token = 'fL9m5oxMGoMHx7D5DsGBfsETLL9ElcVMPr+gEoPMPs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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