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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6960e8ae4317fee49d4ae908ddda9d717359094a4bccece407da00aab36e1a4f' 
  AND token = 'XHqWv5piix/4cOxyK3FS0Y8na3/TN4ic3+WQDB16K2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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