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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c023b906cd2d618bb9e89efeae1c3ce17f039032846bc7de82d014728a673fa9' 
  AND token = 'Nz0mwFj7kXat/QqQtjudcAjVZqqNINHe/QZr3puEWgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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