SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26b13bedb765f18ac9a9c523775ee5e7ffe3450246db2406ec7f4d1ceb088bb' 
  AND token = 'lojzwCaYCA2b9+wBJG7GaEw18En2HJX/jARbnZ8atqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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