SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac337087a21335842f4c5673cc081bcddcb8b0b9c34553c0939851ab065eaccb' 
  AND token = 'MjfhNDEnP3iGeCvbRFDv9dVtx6rQ+QctZrCHDpKkWoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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