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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e367e6c5a96ee8b0ea7588a81a96fafa8247afab37d430b798987b0ee5ebbf01' 
  AND token = 'IDNgUiH4aNUifFscxzdV08+TYdXlm2ch4n07wBZCuRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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