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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080b502cf600df531b93f5ab6c030bf2e409f3948adca9a98299718c5088e2e9' 
  AND token = '54HsHmBMlptAIPueHhG7SVIIRO3pNxyP8SPJNMn3wOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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