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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdf3eed59f7e746f56f86cff98de65ea9ad751653f940fde6a6bd6c54a4e3e1' 
  AND token = '6hGa6z6Ys1lshzurVuMQQtImxvLTS/MxpdRa05jorik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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