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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf5fbda505c78fc8d955460ee36d93b39957b16d900f3411ab25253fd754be2' 
  AND token = 'FkKy0ft29F0VGjvpX1OVIZi5kvF1ed6vDQPUibx1TaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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