SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4038b3b4a74b69de3dd19ffeb36a0d5314e48ac1ab534f49313bf4707882bf27' 
  AND token = 'flWv45lDUa+9Lbt/bPWK2XJ1pINaerZlOh6CrpLResI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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