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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2a558824d79e8e187228245aecb5cbb87c9fa1c4450cca758792b875922318' 
  AND token = '9S4Faalg/FfxZuUsW2oWBuMAheZaYQlWkiBAMNRHy0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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