SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd144c134c0bc52794c479d47d5878e3ae4f663600312f6223d7b52c4fe3ef051' 
  AND token = 'cw+mWPjKqywB4d4qG+VL1KQGp3HwCtpeIDiP/uffoo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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