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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07d7c269e71d9f439cc68dbf727bad68964d2fd602c37181a42516f83728ec3' 
  AND token = 'lYnq3xWP9L/ZekcUF/PvxdH3q24S5zTONaeen+xuAF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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