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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bd8904445db32a1ffc02a333fd1cc8e02f125944c3803002acb7bb86400894' 
  AND token = 'qUBgJYqEy7MJ8ywSY7u1ZE+hQtZYg3h+423n5A6C8Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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