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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e90abf5865977ee83a55b67304c913974d8cce58dc0a8b190e6301d4fe754c' 
  AND token = 'XTw8Bui8xvOh/7jgBIFMgifBl3tmZ/zegac8+OBhseM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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