Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e4252d39777853f1f4142416c8466a8f8e12291d62a05caf8bfc21220ef66d' 
  AND token = 'LrDo0PQx4y8SvRIkm+dlOIw1X+7vJsnHpOFYaBtTyHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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