SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0279b43488af12c33eca43c18d6d46fa8d5d01d855bb360933c7f06027b1abd' 
  AND token = 'gJ1fqgwKiqe5e8eCRqtwWXQ6wbDRSBMpJ62WhUmGjv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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