SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725c4819c48dcac8d35c7a70ef902582a1ce640d82747fe9d2f489b82e0f46df' 
  AND token = 'whVGOAuwzx2r0csXog+SJJCuzkgUDF0rWdQfYMvj7Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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