SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cd5264c03d3a0952e3614f403ba046d52dd5b9a4d7bc35fbddc535524a1547' 
  AND token = 'TZvz3EaG3DRFJy3VgjPYcfJpg5SZCZnYBWilWZhSq/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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