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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd30a43560d74d8a6d99b1e37e505e0d5c3fb963128c29ad12aa49493b8c9dd' 
  AND token = '/UE/+BuzL/S5TXGOXK0/ZlbISuH5fFFpafOo4FJb9W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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