SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f15a161c27dba1afc3d44c821a85e9b6cefe49380b326839c694dca196111f0' 
  AND token = 'ErLG/8/yFjEl8gFP9zLvHgKjxyiGCpzdkTihtRsq8XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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