Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f98c66294cfb0df81c1a54b99d10dca9cd40982bec71ef928192a16294debd9' 
  AND token = '5FR98ufQtqS/MqvshZlSd4ARdwPKTVr3nSWyjVajWAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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