SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06966224e7f9d5fcd0469b6304797f5a5ec133d4961b340a573de529d049388f' 
  AND token = 'bpwjUZSgFNecsYz16x1qQMYaGHGqJIsPBw7X0oX+CbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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