SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e0a92c434cba585c8a27ffe7f87465c591442e64a651548b194b75b973add5' 
  AND token = 'Ytm8f1ZCZ+/NIUKzJSWxgLUAqsPB3+tf6G2Vh19V0DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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