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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769683ca02edb468b22fadf55c63bfb036d5e03f1ed7cd57b9e5b260d649bc81' 
  AND token = 'cBPZtPXDC15KKd5WG5WP6+exX8d38zlJF5P4t9Dzk+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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