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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4936cad3b49764391464fd32b38a170b82fa8e461801a4ba49ac914e543b05a6' 
  AND token = 'nxFf17mZz0K7Su+xJPZFFLBlPF72b1GJ5pFf0Z5Xg5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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