SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0337f4db86ebf188a25fb3d55023f6873a661799d59b935b79f7166d86e98479' 
  AND token = 'hvHGQmOBHKt3wC0cJoWiD5eU6oQoIPyX+XfpCVnaWAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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