SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7a99e86c93ce505622bce398451be921b5b40294501bd48c5784ac1a6f654a' 
  AND token = 'pGezkR04Vuy+Wt4Cykb7qiWEL5EWJ8qHUx5/37XToPk=' 
  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