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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd5695c5fc134da0e53d061999539eafaebf219f3ba3ad9b62de33a2b1c5b1f' 
  AND token = '7yC4nv5M683KJ5LHveK58bYNy8mdL47ZhLnJ4xhGXAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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