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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4a849e681ddcadfc8931aa0f219e13db499a9f10b4cef9f20bb96b13faab54' 
  AND token = '2f8NyHf+JhGITnmUzJHViBzvK5ta0F0NhNnZq+tMFls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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