SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf09b8148197b0b66ff792a2b2dadae69a24e1ae6274a378c2bab8e8e6f11316' 
  AND token = 'h6U6T55r+XLgzdSLJEvgWvOhwrp3qnl+dWoVOMZl8J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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