SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95452012dbb13ae79de211c3dc320368306256097e5fe0ff04a86e3f7fe9b41d' 
  AND token = 'Yq30nyzI2QgVWzOD/rwt4C+qCSHVoqzFMP8mlACbi/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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