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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c06fd3cd07cc1f9ce8d69f0fca8a2c3ce4349e19ee5db8b616d12ac880c9ddb' 
  AND token = 'z5Qchh3eWBoeWk9pnIpUZrtjT9elzMDo5BSOmx8pBlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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