SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6ce0613828b56bd5dfdb9f2f162564c71c3c1eb3e49d27cc6598f152389d98' 
  AND token = 'Fv+q3NFmbYkMZGCDJh+0oliWcGEfCsAEfm4gPKh1H84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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