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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559ca310b97762f8511841a5f7c55e96aaff10aa4b4106c0fab962d229e8406f' 
  AND token = 'Djyzh1V+tCs1nwgkzhTCceseD8BaWZd9JcOQHlx6Ay0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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