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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9724f9576f6c58cef02fd9d74554a6ae1d32f6702b9fe68ba05d3af3db6768eb' 
  AND token = 'M9VB0vShtKcoDx+O0CEOhLPMtT60J5Wt45L9dMe8w/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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