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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005fda7688cf570a9c03017abf8f63c05df7a7b99888db84fc862e5780b298db' 
  AND token = '50DMk78o/YEIx6ogozGgzQrwS6TiKQI9ymB44SydF1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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