SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4c02cc895aa7601691b074f7f89f4d5613ca5327feb6407e732583c6336380' 
  AND token = '0xtJel5rPDxU/VChFX5uBtpG/ULLqdWRyrWp5HGKLBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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