SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf124a9f8a7a7faeef05bfd1762d6af9c34249ce14b3a6a1628f93122f271ae' 
  AND token = 'h0SEVA/DcNLIDGJJ6mUorJ4jeV06G0aGAv6aSyKJ5L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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