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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd502e3cb59cad598093d2d51df4073e6efb9b5f4fa5b7af1343c504f4f1fc6' 
  AND token = '0dh6woJgiyIVey/mn5xhqCzpMZcIj81TNx4F9kj2P9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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