SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a58fabe92ae5871ae8bb672a99e15ff5b3f4b18ab89314a4f21bfff320b470' 
  AND token = 'YvMG7RW6FYSHV/WU2dFpfBH5+tq/FgJyQwUFNfQb0lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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