Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2383472da47133d3709230a8d9870599f919cf64dfd290d8988c06d2467e88a5' 
  AND token = 'Ypfeoj5hs5lObG3msf+a7IShhh2iO9Z/awyG+Ulm0HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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