Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba5ce432fbabe74471c4f29544eaf7ddaa7012e884eb3338a50349bc242aa89' 
  AND token = '8i/3DHLIIg1TaQkkmnUYkrfDsrrxtYjGSxiRDbeWG3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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