SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69914fd7e207f8cfa4864516226972cf08ab6c7c58f4a62a3f1b4b5967075607' 
  AND token = 'gWfuHw25PJs1fuWnE23olKkBvZ0/rDC1rPAzJfeVjqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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