SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28e7d43dd7e553f7e11a20b6c21882d2e917f2c63406d7060d2b0113f22170a' 
  AND token = 'qwJ9LVvNNHu2+4n1ebKf8YHYX/6CztX4M3hhptgk+r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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