SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0879a292b6626c442294a860843e9e7a6d87cb41434f08aa637099da61581c' 
  AND token = 'FNJNvJ36YkwxtWgwvf5gbmbYFRfzjVDg6Swl5uQXGUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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