SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e41795f40ade1eff3309630ad94516c765085437c68f1bbeabef4f06f15dd6' 
  AND token = 'rZnSiAI2hz5s+up98zYV5Q+7/BGT4iDgmhcWs/YY35w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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