SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e9db858124e4e03e5b9269f7dfb84a4c3a7e86e6985872d2f4f946187ca695' 
  AND token = 'dQmoVVyvG2hN/QpXwJSNvYd13DjWqXW9aCAoFxolwWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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