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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f030f9c666e0268e304aac9e4031182afe41cd4aa135924cf77a5a929ed192a' 
  AND token = 'V4ad2cdns3nsHu/lJWHhLU4vQTUGu4oGbUXxw7iZFlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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