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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eb8101b6c809e470e5e03919b05f897c130e0ccc510178bb7432f706f59bc0' 
  AND token = 'yu94pFaZowEaV1A64YdQevVm8ebnJ6OevwbgOpFRF3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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