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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596a636fce3f1e3efd6f2206c05b4248b6d12f245aa602da8282971f71be331d' 
  AND token = '498zhMTk8G39Zb/iCukoxpjp4ia8Y31eTWZpV9wdtzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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