SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54967f18ac6c1d80241cad9bf7f9a1926a566ae2cf10ffb64bbd48f42d87bc46' 
  AND token = 'XNoDfZd7S74Mj5/KPaNt+VILucokJY3Pq8/6FzxQQug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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