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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0a59eb4465b88adc92243693490ea6c3d9dd7e9e93246fa9c06ce33edae95e' 
  AND token = '1y1opjE4doIakSvp2YMFeLMWsjOqmJpz/PatvopY5bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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