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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ace218602e2baa3fd83ee9ab73e9e7675deb161db98c41eb5fff977c61b9a43' 
  AND token = 'gWTXEp6E2nfcoKgzcOYjP0QhocFtv7iAkWsYb+YNd7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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