SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698fbebdd373ad4fc7070cf8c8a4f817d3a9a3153a7f6a823cdd455d6e934d5f' 
  AND token = '/RRmvX2uu9sIvWkDLqorhKMLFEC7aGwXYbN5YWnkIVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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