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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7040578de81f3846a1a6a360d0411b062a6808d244d50b1d8e919f2bf3bb10' 
  AND token = 'rdKrLgUirrCx0yVs39yVbU7CWyZxoPYxGdeH+aQqi/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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