Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81086493453307a1a646eebcf133db73408358bedffa6989e668189df717fb41' 
  AND token = '1hNYYjgMtV47NxNyr3JWPk4s6vAxxj2MbJNTXvRtwTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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