Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c5994d209722d4b13027f1bfc04864524c86e85c71f4f9887dcf2a70a687ac' 
  AND token = 'eVtAcXND76K1NXLxry+NAuJpkzZcuYpKohbpWqVnna0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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