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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b494a4d92dbbad42ff42b9c288e3bed061e9c979d7bb5ae22bae331103e1d967' 
  AND token = '9xSuwV9OsdIoW8BdrKqi2VGjv2UdBeVuiBAtZmX+8lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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