SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbe0f8b7f1ed3be87897a56e29147c6c967bbff763ceab7d4626047d0f19cfd' 
  AND token = 'aL/iMK/RM8DwAZOvv0GJez2eXufGGDzWBjT8jb3lgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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