SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad2f7be26aee3bf35fc581f3fd72c49812b0507268eb34196ff94bf8182550d' 
  AND token = 'hjqOQdPADrFwJhB/g0WgIgqOAez1xTqm8VNX6IkBFKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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