SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dd3d77f6af7df00b6de1e1a8bd51f39c5eca232d3551969474c45b87a3578a' 
  AND token = '1KWVwmovnhrfUggZoyCxdvasjjR+qK3YK9Jlbgv9vgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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