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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df704111f4567afe1f41a196c0b245833a5ee7eb427859edd00f378424905fe' 
  AND token = 'QMoYSO7nUxDE6saq9MeuHjWZamILPRvuUW43Ka4IgaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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