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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85283f1ed9fea9af43a89635cd8b8aea368ad8502e77bcf384a605bef2d40639' 
  AND token = '8Ve0JxYZ57UMs1HLlij0P81CJ39LlzHnFVDko7py5YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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