SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59e9660814b9c027eb2f2939b38fbfadfef7440b02123c863271203cc1f0ac8' 
  AND token = 'rWsgaamINvxjNEbDSSRrn62Dl++Cfjl6MpfNGFYM72Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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