SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84d5aaf04757b67f2ee96c93aed23d9ae45b87763b5b0d4d6e4281b2c33d297' 
  AND token = 'Rtf0zSuIjY6j45qcfiWwdYo5JGmwB/JhjVDgqLBC964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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