SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a48979b0683564faf5a63d88dabe36e4c0f332505e9d64f5a9487e2368182d' 
  AND token = 'o79wGJb0ynqjtgwCJcYjSmYynF1wGqqdizaz3h4bkX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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