SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c2d5fb1e30e7967351b2126332025a82f4ae0153bda392106182853c577276' 
  AND token = 'X78tzmgz93EAxV+R1wQWnpGfQTc9K8vyk56mBfjzihM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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