Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61c35a7daefe9ab78ec885d4be42ff6ca3f3d3dab2b541b9f0f34c8bdd99dc0' 
  AND token = 'mwOGiXY1cOOYcvvvdqQhRcqdzwNB7hYsLhwtTU84SV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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