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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c62f07dbd51491864ca9942bc1ec616a121950636cfc00c43226f168e4cdd29' 
  AND token = 'Z7goOlNgKOGkURXb2JmJr0O6S+1WY0qyoGCbdQYnqOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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