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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726d4d4c65d68762f3ce528256d19bb910a13b97a44c8a287e1fe6fd7b0528d2' 
  AND token = '4VqPkR2qZxu5gnJfk9mnvXAYEZkVosUeAeMqRVSGu9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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