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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8931be208134060c613a68b17813e2afc9bf59964c1726c61a960fe571ae48da' 
  AND token = 'W0ShwGMmCs/PowmdnIKlcyU5pZEtOCtCog0ZBmc+TZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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