SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855dfe7aaa5f2d7501d31601e82892e9a5a48aa3dbc4414e0743c30742e26749' 
  AND token = '8jqfQA+aJAA7OjEs+445zmDWsn5bRKRt3uAKK685ml0=' 
  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