Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fdd4c0609d7ca08d0254882f4df7c9b42e17e54ae5f1268e39492afd51c910' 
  AND token = 'SqasZxsYnwQKYrM5joqZBioeRYdp10FrvukzpIFIr8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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