SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded872be807970e1d24bb3dc26ace6ba06ba52581c4aaf8301c41fe8e526b2b7' 
  AND token = 'J33/QqnwtPyfpdlzhcKvJSxFgdLRndtRjtmX9VA4vZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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