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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb962df892e85ff8aac101026d73cf7943a5cc33608adb67f2317e69a41c4efd' 
  AND token = 'zaYyTthnP339BP4IiHz4P52CH47yONNa6vxF0YUQ9ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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