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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f7230c4b7153a70b41b9e27a1b2627c61bd4aa9e93d67e6d3789f709cc7fae' 
  AND token = 'mbYzH3a/py+z7tAtuj6Wclf/1cy2wb7T+xwvjqWdXog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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