SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc9021674d90b2694721a6298471877ef178bb9ade57242de815501e26be038' 
  AND token = 'bL79V+/5whPtBQTZKzLlZi67c+CnDFGr/qEnossPVuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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