SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d95f899767d584bb2a8ab5bcac547df27eb3569c072daf59399c75f7b032474' 
  AND token = 'EioF4nty4HKFrSlowtsv3G/NRAb+OGGLOhgY1B1ak68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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