Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16586cf939eb1be9e28bf34ebc6a4da54b752b449ae7cbc78c756296216450ca' 
  AND token = '/xYns1MICVXohC66nAgKvMyrbOoJa/k9UnVwcL6JKig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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