SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d910a6c386b6f90989045cd391c6d72f38360a9cd1ea24a6ec9c3c579c872a' 
  AND token = 'ysEbnX7IqUgwJKu5DTB70Bi8DZ3G+GOm2wsXzpAFiVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}