Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcb816b0089dbc2818d96ccf2bd4109838402c4a49f60931c74a012a9063a9c' 
  AND token = '3dtxcYOGAdpX5aXaBiBgOAih5StFw6YBwX9V4GLsJ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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