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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fa7868449dc7b53b25b60742a423d9c0d102adbc990f423d66e2317cf636a4' 
  AND token = 'S7rUyfcdqzRpgXI7Hd9HY8/wfWAoAjWVnVFUUxnupN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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