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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113bbec8e939519d58adf5a607975b05d8ce94f5d9c503397bd54b08cd98efbc' 
  AND token = '5wU5k7gbE/rHo++hxbqGkiEAgiUNNh4xast3G8BF7gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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