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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598fdf7473ec7be02056529b20d0bf13f8bbab933f873c0bf01f65ddf7c69691' 
  AND token = 'Onn67fiL/t/hcFeU0HJsCZB/yGEzIrZk3XFHL9Eo3vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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