SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7295384a4983d836766342b99a6c2bb3453a592e26a54bdd4b2ae9d491147d' 
  AND token = 'LYnOcj7sh8nlaXMNkJBqjKRF+DBS6qK+Vr/ZDl7JsRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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