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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479ebcd14d24bc7dbc6d195919bfb03a819bcf3d5410cf87408bc3ec4a28bd20' 
  AND token = 'rup63+2eJ8LF+7sguGmgAg5drUiw5w+QBzbNk9vwaDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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