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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72275348e50de13d952f9982e18fd19f65401eefaa9b3f4bf99101f9a732a10f' 
  AND token = 'oT5X/v8TbHFoJFBxxi8GWwoHfN0SNmTvKkFBF0XvnPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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