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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c831a990f921a94ba8037cb9868117d5f5f6fc991bb2de0f618f234a014c233' 
  AND token = 'F99EIRQyuN/8OZcc9JtcM+owlP8XaVQkxECCN6+OgDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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