Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321e131e2c6d679fb986d7aef954af929e85a66974a16cff6c39d0c3e63ff96b' 
  AND token = 'Uyhoq+MOtKe+dKrkQNj8giTS3rcz5QTPY+Zy1Jy5MO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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