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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e233f38f39f94f01422e81f2dc7691aab81f75866113692a6ab3ff894874379d' 
  AND token = 'KG/sOBqOG78Y5xslKaY9Xd9AD0LriRUcc7pyKS2xFnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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