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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6717f62d8a10058777fedf28bcbd184c69eadbc296dfe37a1ccc1c331dd2eb20' 
  AND token = '0wS0qU9Cd89UBwNsuJhNY1YUQy0O9MJ7nMMaStyq+og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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