SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a96a9296a13098fc4e8ea91c4424628957233f5b676e68112af15ff733ef6c5' 
  AND token = 'hD2cyGM1tVKIUCKJK2Yan23o+sZOYhGVIuw1/PGD/Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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