SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41127ebf5d4198f89b4a16cea8471345b5cc882bd7c51d6f1e224b309da80b0f' 
  AND token = 'hWsGPYTe2H6aOk0XDyIACSWKlOqxcU7JwVCQY+yOrAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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