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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36234670346ae612c8e5f2e7ce3d9ad7674870a01d75f979d5d473b13821231a' 
  AND token = 'xlF1EM9XK+xoLrkMawiNd0ZVDk07s3c9fXGrZkFV+/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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