Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cf278a7e8076175026eb21b5254bd903ae6f8dfa14740d42452fb9ecdf885c' 
  AND token = 'xxzAiUJ+QozNHqntcW1vqezCxcbX+iDL3BOo3u0adb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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