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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5900c1394b947e3efd4b1b480ac0ebc7b048f99a0654b9388e09c6e5a84cf54' 
  AND token = '5X1fhx11boI0hFMvHmNQd4W6Al/3u5M8vvRw/0Od+BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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