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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f4b5eb63ba79a779be0a10ddb6d60b686bcdf1ccb0b71ee77a994accf2fcbc' 
  AND token = 'XSDr+7LFFARvIeAr5UokmVTXdepn/3E2NNQXQSSbjQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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