SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b1da7f51a8232efb6a4c8fdf82cf244df5861d39fa8154d6443ef5a80d96bd' 
  AND token = '+MfBk9Qu3LjHgKQ5jxJzPdTI6XYCvKUoc4mqFga6e5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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