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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9cda2476af3d712a3da4a42cd929da691afd3b63a8ae74d106b74f5596c804' 
  AND token = 'gbAd8esHavJSUbZEDHa1tRdd9ESOL/1BOAslvkq3vHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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