Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d3f365cda5bdc6d8a2be28288e76c1c73c19dd39e1ea9ff6766da0431a2470' 
  AND token = '5viw7ycUcZq5myoTA3p0WOBfe1vVQ7api3bLLYxbMRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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