SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f1e2e612a8979b177334e64a7796465b822b84ae448b1b3c82430ffcbd1084' 
  AND token = 'y4sSBOrcaH+qAbK/+7Xz3csHoECmyN1mYB7ESv+4ImA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

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