SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5294040cd5a0139a4b8f9c0e54d697a786ef7def2ed6b2816181868c598635a6' 
  AND token = 'qTgmaaZhY66z597WZGqaqiEvwSVwtEuzGbekRJRoX+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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