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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0517c600a8531aaa9fb381b0f92c49debcefae9d83f4c0c7c84e4f4f6cfca52' 
  AND token = 'AnNqThLhzlJ5rFy0TAn1N6H8xaJ94/u1a8jXsmPQ2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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