SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117df63a1a0338cde6ff859c967dcf4bd467ba232b6f0bbe27d5237cb41461b5' 
  AND token = 'WKrW+lwzTxGjBgGjuY3lJTbUYFth1Ml0wpe3eqZB5pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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