SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3dcad3635bb630bfc8318d263fb9677761d82e1262abf15a49f922866880840' 
  AND token = 'cN74oKiOqGyz0arzZxgoFpIfeXpmTECUKHuqkDgv8YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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