SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ca5473a51a62ea7d57fd195a3d57243e17f18677489bd248c8176ec171b521' 
  AND token = 'afqhCRwKvnY3F20Pf1m9ABhCCqoH2MHkJ7b5Fz/Z/20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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