SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6177e24849ddbf2a45b486750f6a7261c872d002d445ecf0086134a48c375165' 
  AND token = 'TXmBzfCfqJLUZWi7J1BgAYwHxtIJ24sDzy5+kXJIlOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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